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      1 /*
      2  * Copyright (C) 2007 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #include <stdio.h>
     18 #include <assert.h>
     19 
     20 #include <cutils/properties.h>
     21 
     22 #include <gui/SurfaceComposerClient.h>
     23 #include <ui/PixelFormat.h>
     24 #include <ui/DisplayInfo.h>
     25 
     26 #include "jni.h"
     27 #include "JNIHelp.h"
     28 #include <android_runtime/AndroidRuntime.h>
     29 #include <utils/misc.h>
     30 #include <utils/Log.h>
     31 #include <cutils/properties.h>
     32 
     33 // ----------------------------------------------------------------------------
     34 
     35 namespace android {
     36 
     37 // ----------------------------------------------------------------------------
     38 
     39 struct offsets_t {
     40     jfieldID display;
     41     jfieldID pixelFormat;
     42     jfieldID fps;
     43     jfieldID density;
     44     jfieldID xdpi;
     45     jfieldID ydpi;
     46 };
     47 static offsets_t offsets;
     48 static bool headless = false;
     49 
     50 // ----------------------------------------------------------------------------
     51 
     52 static void android_view_Display_init(
     53         JNIEnv* env, jobject clazz, jint dpy)
     54 {
     55     DisplayInfo info;
     56     if (headless) {
     57         // initialize dummy display with reasonable values
     58         info.pixelFormatInfo.format = 1; // RGB_8888
     59         info.fps = 60;
     60         info.density = 160;
     61         info.xdpi = 160;
     62         info.ydpi = 160;
     63     } else {
     64         status_t err = SurfaceComposerClient::getDisplayInfo(DisplayID(dpy), &info);
     65         if (err < 0) {
     66             jniThrowException(env, "java/lang/IllegalArgumentException", NULL);
     67             return;
     68         }
     69     }
     70     env->SetIntField(clazz, offsets.pixelFormat,info.pixelFormatInfo.format);
     71     env->SetFloatField(clazz, offsets.fps,      info.fps);
     72     env->SetFloatField(clazz, offsets.density,  info.density);
     73     env->SetFloatField(clazz, offsets.xdpi,     info.xdpi);
     74     env->SetFloatField(clazz, offsets.ydpi,     info.ydpi);
     75 }
     76 
     77 static jint android_view_Display_getRawWidthNative(
     78         JNIEnv* env, jobject clazz)
     79 {
     80     if (headless) return 640;
     81     DisplayID dpy = env->GetIntField(clazz, offsets.display);
     82     return SurfaceComposerClient::getDisplayWidth(dpy);
     83 }
     84 
     85 static jint android_view_Display_getRawHeightNative(
     86         JNIEnv* env, jobject clazz)
     87 {
     88     if (headless) return 480;
     89     DisplayID dpy = env->GetIntField(clazz, offsets.display);
     90     return SurfaceComposerClient::getDisplayHeight(dpy);
     91 }
     92 
     93 static jint android_view_Display_getOrientation(
     94         JNIEnv* env, jobject clazz)
     95 {
     96     if (headless) return 0; // Surface.ROTATION_0
     97     DisplayID dpy = env->GetIntField(clazz, offsets.display);
     98     return SurfaceComposerClient::getDisplayOrientation(dpy);
     99 }
    100 
    101 static jint android_view_Display_getDisplayCount(
    102         JNIEnv* env, jclass clazz)
    103 {
    104     if (headless) return 1;
    105     return SurfaceComposerClient::getNumberOfDisplays();
    106 }
    107 
    108 // ----------------------------------------------------------------------------
    109 
    110 const char* const kClassPathName = "android/view/Display";
    111 
    112 static void nativeClassInit(JNIEnv* env, jclass clazz);
    113 
    114 static JNINativeMethod gMethods[] = {
    115     {   "nativeClassInit", "()V",
    116             (void*)nativeClassInit },
    117     {   "getDisplayCount", "()I",
    118             (void*)android_view_Display_getDisplayCount },
    119 	{   "init", "(I)V",
    120             (void*)android_view_Display_init },
    121     {   "getRawWidthNative", "()I",
    122             (void*)android_view_Display_getRawWidthNative },
    123     {   "getRawHeightNative", "()I",
    124             (void*)android_view_Display_getRawHeightNative },
    125     {   "getOrientation", "()I",
    126             (void*)android_view_Display_getOrientation }
    127 };
    128 
    129 void nativeClassInit(JNIEnv* env, jclass clazz)
    130 {
    131     char value[PROPERTY_VALUE_MAX];
    132 
    133     property_get("ro.config.headless", value, "0");
    134     if (strcmp(value, "1") == 0)
    135         headless = true;
    136 
    137     offsets.display     = env->GetFieldID(clazz, "mDisplay", "I");
    138     offsets.pixelFormat = env->GetFieldID(clazz, "mPixelFormat", "I");
    139     offsets.fps         = env->GetFieldID(clazz, "mRefreshRate", "F");
    140     offsets.density     = env->GetFieldID(clazz, "mDensity", "F");
    141     offsets.xdpi        = env->GetFieldID(clazz, "mDpiX", "F");
    142     offsets.ydpi        = env->GetFieldID(clazz, "mDpiY", "F");
    143 }
    144 
    145 int register_android_view_Display(JNIEnv* env)
    146 {
    147     return AndroidRuntime::registerNativeMethods(env,
    148             kClassPathName, gMethods, NELEM(gMethods));
    149 }
    150 
    151 };
    152